Crane : Final Assembly

Side View The crane is complete. The only thing not pictured is the block and tackle which can be attached to the base trolley mechanism. Overall all the design objectives have been achieved and tested to ensure it. Where it did not meet the original design the art was re-designed and tested again until it … Continue reading Crane : Final Assembly

Crane : The Trolley (Pt. 2 of 2)

Trolley The crane trolley is what will allow for the hooking mechanism to travel along the crane boom. The trolley can be though of having 3 major parts, the first part is the span that connects the 2 plates left and right. These plates are identical except for the fact that one of the plates … Continue reading Crane : The Trolley (Pt. 2 of 2)

Crane : Basic Assembly

For the most part we have all the major components of the crane and cane begin a fit of all the components. All the major components that were designed and re-designed can be seen. The fit and tolerances are good with all parts fitting together with no interferences or excessive gaps. Crane : Side View … Continue reading Crane : Basic Assembly

Crane : Base

The base will anchor the entire crane to the ground, it will attach itself to the mast and then further attach the crane to the ground. The crane base will have components that will be embedded in the ground. This would be accomplished via a "J" bolt, threaded at the top where it attaches to … Continue reading Crane : Base

Crane : Mast (Pt. 2 of 2)

Original Mast The mast has changed in the new re-design with the diagonal cross-member. The mast now has a a vertical force applied to the top and 45deg force applied at the point where the cross excess of the allowable material stress. Member meets the mast. This has shown to produce stresses well in excess … Continue reading Crane : Mast (Pt. 2 of 2)

The Re-Design: Swivel Mechanism (Pt. 4 of 4)

The Old Cross-Member The old assembly which has more parts and a greater amount of assembling to do, however it was found to be too complex and many of the parts were found to be lacking requiring re-design. This re-design of individual parts meant that it affected the other parts further down the design requiring … Continue reading The Re-Design: Swivel Mechanism (Pt. 4 of 4)

The Re-Design: Swivel Mechanism (Pt. 3 of 4)

Current Swivel Mechanism The current set up has a roller rolling on a conical plate to allow the boom to rotate. This was too complex and had too many parts thus it was re-designed to work with the new cross member. This old design was the trunnion rest model. A new mechanism was done up … Continue reading The Re-Design: Swivel Mechanism (Pt. 3 of 4)

The Re-Design: The Cross-member (Pt. 2 of 4)

The first part that was re-worked was the upper parts of the crossmember, the boom attachment is now a single flat plate that bolts onto the boom. This is now welded to the cylindrical section that makes up the cross member. New upper cross-member However we can see that the Material still has some stresses … Continue reading The Re-Design: The Cross-member (Pt. 2 of 4)

The Re-Design (Pt. 1 of 4)

The re-design, means that we have to find a way to get the cross member to handle the loads as well as be dis mantled. It must still bolt to the boom and at the roller rest stop is should allow the member to rotate along the rest stop. The current arrangement uses regular shapes … Continue reading The Re-Design (Pt. 1 of 4)

Upper Span Assembly & Re-Design

The upper span assembly forms the part the overall assembly that connects the boom to the cross member and then on to the brace. This piece is simple enough a simple T shape with 3 holes that position it at a 45deg to the boom when assembled. However at 11.113mm thick it still can not … Continue reading Upper Span Assembly & Re-Design

Crane : Boom Bracket

Original Design The original design was tested with 37.812kN of force in a downward direction with Armstrong 240 as the material of choice. Right of the bat we see that it is clearly unsuitable, with a maximum stress of 999.5MPa located primarily along the vertical members of the design spreading outward from that. Note that … Continue reading Crane : Boom Bracket

Crane : Boom (Pt. 2 of 2)

The design going forward had holes drilled into the rear so as to a fix it to the turntable as well as holes drilled to accommodate the mounting of the cross-member. This geometry introduces new points for stress concentrations as such this increases stresses which may necessitate redesign or the selection of a new material. … Continue reading Crane : Boom (Pt. 2 of 2)

Crane : Boom (Pt. 1 of 2)

Now the boom has been adjusted, with the overall design having a cross-member, this introduces new forces and geometries that have to be better taken into consideration. The initial design while demonstrating the basics when applying "the math" (number & formulae) is rather simple not taking into account all the forces at work. The modified … Continue reading Crane : Boom (Pt. 1 of 2)

Cranes : The Trolley (Pt. 1 of 2)

The trolley is the part to which the load is attached to, the trolley also allows for the load to traverse the length or at least a prescribed part of the boom. The load doesn't have to attach directly to the trolley, the trolley can by means of bolt holes can accommodate a motorized winch, … Continue reading Cranes : The Trolley (Pt. 1 of 2)

Crane : Swivel Mechanism (Pt. 3 of 3)

Basic sketch of swivel assembly The swivel mechanism has 3 sections, the upper middle and the lower. The upper section attaches to the I beam boom by way of 4 bolts. The middle section sits between the upper and the lower preventing any contact thus allowing free rotation of the upper. This section is ultimately … Continue reading Crane : Swivel Mechanism (Pt. 3 of 3)

Crane : Swivel Mechanism (Pt. 2 of 3)

The bearing can be made smaller however this would increase the complexity of the mounting mechanism as one would have to be designed to hold the bearing within the mast, by keeping the bearing larger than the mast diameter means that it can fit atop the mast with a lot less modification, or a the … Continue reading Crane : Swivel Mechanism (Pt. 2 of 3)

Crane : Swivel Mechanism (Pt. 1 of 3)

When designing the crane it was necessary for the boom to be able to swing, this adds to its utility allowing it to be better able to lift and move objects over a greater range. The first and simplest mechanism would be a pin hinge and a bushing, this would be the simplest. The bushing … Continue reading Crane : Swivel Mechanism (Pt. 1 of 3)

Crane : The Mast

The mast in this case is the free standing vertical column that that the boom will be cantilevered of. The upper portion of the mast will have the mechanism to allow the boom to rotate, and the lower portion will allow for the crane to be secured to the ground. The basics of the mast … Continue reading Crane : The Mast

Crane : Stress & Deflection

Beam Selection After the continuous trial of different beams, the beam with the appropriate 2nd moment of area is chosen. For selecting the beam we look at the flange width and the beam height. The 3rd factor to consider the beam weight. From the chart on the left we can see that as the beam gets … Continue reading Crane : Stress & Deflection

Crane : The Cross Member

The section we are referring to is E-B, at the point E the joint is fixed to the base of the boom, this allows for the section to move with the boom. At this point, B, their will still be an upward, lateral and resultant force. The member E-B is 2.121m long, and will be … Continue reading Crane : The Cross Member